This argument lacks so much nuance, yet I see it in every thread where a communication platform dictates who can and can't be heard.
The danger in the idea of "just find another X" is that, if you are willing to believe that the action in question justifies an open platform's prerogative to censor, then it follows that every alternative platform do the same. This creates black holes, if you will, that are incredibly easy for dissenters to fall down.
I'm not saying that I support Trump's message. But, as a society, we have to be nuanced about this and figure out what constitutes a right to use on massive platforms like Twitter. Twitter isn't just some dinky website. If you are worried about Russians/Chinese/Republicans swaying elections on social media, then you'd better be worried about how Twitter itself picks and chooses what you see.
After all, exactly how many levels down will we go?
Twitter: You can pay your own hosting fees.
Namecheap: Your users can find you at your IP address.
AWS: You can run your own server hardware.
Intel: You can build your own CPU.
Electric Co.: You can generate your own electricity.
VISA: You can take payments in cash.
Hospital: You can use your own butterfly strips and an ibuprofen.
United States: You can find your own country.